Answer:

Step-by-step explanation:
The coordinates are:

The parallelogram is attached below.
To verify if these coordinates form a parallelogram, we show that:
Using Distance Formula




Since AB=CD; and AC=BD, the coordinates A, B, C, and D form the vertex of a parallelogram.
Step-by-step explanation:
15 × 6/100=0.9
15+0.9=$15.9
Try y=-2x-3 (I think that should be it)